The Revo or the Grey tranny Maxx brake will not work on the 2.5 Black tranny. The mounting holes are wider apart on the brake pads and will not line up. The steel brake disk is also too large in diameter to fit inbetween the screws that hold the calipers in place.

You can reduce the size of the steel brake disk and add pads to the brake calipers to have a similar version.